Surfacing machine



M 15, 1930. PETERSON 1,770,549

SURFAC ING MACHINE Filed Feb. 13. 1928 2 Sheets-Sheet 1 44 36 30 (it sac .2

INVENTOR.

A TTORNEYS July 15, 1930. PETERSON 1,770,549

SURFAC I'NG MACHINE Filed Feb. 15. 1928 2 Sheets-Sheet 2 INVENTOR.

A TTORNEYS Patented July :15, 1930 v, UNITED STATES PATENT oFncE nueusr rnrnnson, or cnnvnnhnn, onro sunracme mcnmn Application filed February 18, 1928. Serial No. 253,856. v

This invention as indicated relates to a surfacing machine. More particularly it comprises an' apparatus ada ted to be utilized for various purposes inolu ing the surfacing of g e the-tops of meat blocks or similar blocks as Well 'as for removing paint or preparin surfaces for the reception of a high-luster nish.

Meat block polishing devices have heretofore been known but such devices are in many instances complicated structures involving numerous adjustments and being costly with referenceto material and labor of assembling the same. The present invention has for its principal object the improvement of an apparatus of the character mentioned so that it will be provided with a minimum number of parts and will be of improved simplicity of manufacture and increased efiiciency in'op-.

eration.

Another object of the invention is to provide a devicewhjch will automatically adjust itself to the surface to be operated on vand which will maintain the cutting elements.

free of material removedfrom the surface.

Other and further objects of the invention will appear in the course of e following de-' scription. To the accomp ishment of the foregoing and related ends, said invention,

' then, consists of the means hereinafter fully described and particularly pointed out in theclaims. j l

' Tlkannexed drawin and the following description set forth in fietail certain mechanlsm embodying the invention, such disclosed means constltutlng, however, but one of varibus mechanic'alforms in which the principle of the invention may be used. In said annexed drawing Fig. 1 is a top plan view,-of an ap aratus constructed in accordance with the principles of my invention; Fig. 2 is a central vertical 1 sectional view showing the details of the con-- struction of'my device; Fi 3 is a side elevation of the a paratus showing" the handleand,

switch attac ed; Fig. 4 is a top plan view of the rotatable disc'forsupporting the cutterpins; Iji 5 is a side elevation of the disc shown 111 1g. 4; Flg. 6 1s an enlarged section- I al detail view showin thedisc and cutter .50 pin securing means;

an Fig. 7 is anen'larged sectional view showin one of the air passageways through the fiisc. As is clearly shown in Figs. 1 and 2 of the drawing, a casing 1 is provlded which preferably is formed of an integral casting providing a motor housing 2, a gear casing 3, and a bottom compartment, a portion 4 of which is adapted to receive the disc and another portion of which is adapted to form a. chamber 5 to receive the abraded material. An electric motor 6 is housed within the motor compartment, a cap 7 provided with the com bined radial and thrust bearing 8 being secured to the housing by suitable means such as fastening screws. Said screws also serve to position the operating handle 9 on the casing, said handle carrying a switch 10. The

other end of the motor shaft 11 extends through a combined thrust and radial bearing 12 and carries a beveled gear 13 at its;outer end which engages with a bevel drive gear 14 keyed to a stub shaft 15 which extends through the gear housing into the disc chainher. The upper end of the stub shaft 15 18 received within'a bearing 16 formed in 'the top plate 17 of the gear housin which is suitably secured by screws or the ike, to the casing. A ball-bearin 18 is provided immedi- 'ately beneath the rive gear 14, to take the thrust upon the lower end of the stub shaft, and a bearing sleeve 19 is also provided in the base of the gear chamber. The stub shaft 15 is provided with an enlarged lower end 21 which is separated from the main ortion of said shaft by means of an integra collar '22 which bears against a washer 2 3 provided withv an'internal groove 24 to receive packing .material. At the lower end of the enlarge portion of the stubshaft. A key or fin 27 is provided on the disc which engages a groove 28 in the wlarged plortion of the stub shaft, and serves to lock t e parts in non-rotatable engagement with reference to each other, while permitting sliding movement of the disc when in operation. Through the opera 109 tion of the set screw 25, the lower limit of ad justment of the disc on the stub shaft may be controlled. By means of a locking pin 29 adapted to be screw threadedly engaged in the disc adjacent the stub shaft, the set screw may be held in adjusted position, said pin slidably engaging one of a series of notches 30 on a flange of the set screw. A helical spring 31 is positioned between the collar 22 and the hub 32 of the disc and serves to maintain said disc projected toward the opening through the base of the casing.

The disc almost completely fills the open ing through the base of the casing which opening over the greater portion of its extent follows the outside contour of the casing and is completed on its inner portion by means of a partition wall 83 terminating in a rearwardfly projecting flange 34. The disc, as is more of its radial series. A metal plate 38 is preferably engaged over the top of the pins being held thereagainst by any suitable fastening means such as a. series of securing screws 39 engaged in suitable apertures 40 in the body of the disc.

The disc in additionto providing a support for the cutting pins is also designed to provide a fan for removing the abraded materialfrom the surface operated on. This fan construction comprises a series of elongated radially extending apertures or slots 41 formed at spaced intervals through the disc, said apertures being inclined upwardly in a direction rearwardly of the direction of rotation of the disc and being of smaller area adjacent the upper face of the disc. Thus as the disc is rotated, the air will be drawn from beneath the disc and forced into the upper portion of the casing and over the inclined edge of the spacing partition. The rearward portionof v the casing as stated provides a chamber -mits removal of the abraded material.

adapted to receive the abraded material and the upper wall thereof is provided'witha. screened opening 42 which'permits the air drawn inwardly by the fan to be ejected rearwardlythrough said opening, the abraded material falling within the rearward portion of the casing. The plate laced above the .eyes of the pins is provide with a; series of slots in alignment with the slots through the d sc. A slide 43 covering an opening The operation of he device,- it is believed, will be obvious from 'thede'scrition of its construction. Where a meat bloc or'the like 44 per-' is to be resurfaced, the apparatus is positioned upon the block and the current is switched on so that the motor will rotate the disc and the cutting pins at a rapid rate. There are no wheels or other devices to space the casing from the block and the cutter accordingly will be held closely against the top surface of the block.

As the apparatus is pressed against the top surface of the block, the spring will press the disc with a predetermined degree of force against its surface and the pins will remove the projecting portions of the block through the usual abrading action. As the particles of material are removed from the surface, they will be maintained in motion between the pins and the suction created through the rotation of the disc will serve to force the current of air through the disc carrying with it the abraded material which will flow over the flanged partition and be captured within the chamber at the rear of the casing. It will be noted that the disc is held resiliently against the top surface of the block and that the degree of pressure may be regulated through the adjustment of the set screw at the end of the stub shaft. The stub shaft itself does not move vertically and the adjustment is entirely through the free sliding vertical movement of the disc upon the enlarged portion of the stub shaft against the pressure of the spring. This provides for the properaccommodation of the disc to irregularities in the surface of the block and provides a smooth running apparatus which may be maintained in service without injury for an indefinite period.

Other modes of applying the principle of the invention may be employed instead of the one explained, changebeing made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:---

1. An apparatus of the character described having in combination a casing, a motor and reduction gear within said casing, a stub shaft driven by said motor and an abrading disc resiliently supported for vertical movement on said stub shaft and engaged therewith for rotational movement and said disc bleing provided with apertures acting as fen s ots.

2. An apparatus of the character described having in combination a casing, a motor and reduction gear within said casing, a stub Ill shaft driven by saidm'otor, an abrading disc,

having fun slots, resiliently supported on said shaft, and a dust receptacle immediately edacent said disc and separated by a low-epacmg partition therefrom,.'said receptacle being provided with an air'pressur'e' relief orifice.

3. An 'abradinfdisc fore'surfwcing mimmsss chine comprising e body member provided with e plurality of inclined apertures to serve as airpssssgewsys seizing as e fan at spaced intervals about ssid disc, end s plurelity of cutting pins positioned at spaced intervals between said spemtures.

d. An sppsretudoftho character described having in combination e casing, as motor and reduction gear within said casing, a stub m shsft driven by ssid motor, en sbreding disc resiliently supported on said shaft, said disc having sertures thereflirough serving as fan slots, an a dust receptacle immediately ad- 7 jecent said disc and spaced therefrom by e 15 low spacing gsrtition seid recs tscle being provided wit an sir pressure re ief orifice. 192ssigzned by me this 21st day of Jsm sry,

" AUGUST PETERSUN. 

